Answer the question and explain in detail please, I don't want an answer with 1 sentence and done.

Mandy was a clerk at a store. She climbed up a ladder to reach merchandise for a customer that was located on a high shelf. She fell from the ladder ad hit another customer in her fall. What will be the result if the customer sued Mandy for battery? Why? Did Mandy commit the tort of assault? Why or why not?